In Choose odd Number questions, certain numbers are given, out of which all except one are alike in some manner while one is different and this number is to be chosen as the answer.

Choose or find odd number

144 , 168 , 196 , 256

A. 144
B. 168
C. 196
D. 256
Answer: B . 168

Justification: Each of the numbers except 168, is a perfect square.